red-shift

noun Astronomy.

a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.

Also, red shift.

Compare cosmological redshift, Doppler effect, gravitational redshift.

Origin:
1920–25; red¹ + shift

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary

redshift (ˈredˌʃɪft)

—n
	Compare: blueshift a shift in the lines of the spectrum of an astronomical object towards a longer wavelength (the red end of an optical spectrum), relative to the wavelength of these lines in the terrestrial spectrum, usually as a result of the Doppler effect caused by the recession of the object

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Red-shift is always a great word to know.

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red-shift

red·shift